EP1555220B1 - Positive pressure actuated aerator valve assembly - Google Patents

Positive pressure actuated aerator valve assembly Download PDF

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Publication number
EP1555220B1
EP1555220B1 EP05250028A EP05250028A EP1555220B1 EP 1555220 B1 EP1555220 B1 EP 1555220B1 EP 05250028 A EP05250028 A EP 05250028A EP 05250028 A EP05250028 A EP 05250028A EP 1555220 B1 EP1555220 B1 EP 1555220B1
Authority
EP
European Patent Office
Prior art keywords
piston
actuator piston
chamber
diaphragm
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05250028A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1555220A2 (en
EP1555220A3 (en
Inventor
Christian Dalmasso
Michael J. Masterson
Bradley E. Pronschinske
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Martin Engineering Co
Original Assignee
Martin Engineering Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Martin Engineering Co filed Critical Martin Engineering Co
Publication of EP1555220A2 publication Critical patent/EP1555220A2/en
Publication of EP1555220A3 publication Critical patent/EP1555220A3/en
Application granted granted Critical
Publication of EP1555220B1 publication Critical patent/EP1555220B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
    • B65D88/703—Air blowing devices, i.e. devices for the sudden introduction of compressed air into the container
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/06—Devices, e.g. valves, for venting or aerating enclosures for aerating only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/38—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side
    • F16K31/383—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor in which the fluid works directly on both sides of the fluid motor, one side being connected by means of a restricted passage and the motor being actuated by operating a discharge from that side the fluid acting on a piston

Definitions

  • the present disclosure is directed to a positive pressure actuated aerator valve assembly for use in connection with aerators such as air cannons, and in particular to an aerator valve assembly including a positive pressure actuated valve that is actuated in response to the supply of gas having a positive pressure to the valve.
  • Aerators such as air cannons are used in connection with the handling and aeration of bulk material.
  • An aerator stores a large volume of air or other gas under pressure in a pressure tank and then quickly releases the air instantaneously into the storage receptacle such that the blast of air causes any obstructing bulk material to dislodge, thereby enabling the bulk material to flow freely from the storage receptacle.
  • Prior aerators were typically actuated by exhausting air to the atmosphere to create a pressure differential.
  • the aerator valve assembly disclosed herein is actuated by providing a supply of compressed gas having a positive pressure to the valve.
  • US-A-4826051 upon which the pre-characterising clause of claim 1 is based, discloses a valve for an aerator, said valve including: a body including a recess, an actuator piston seat, and a fluid vent passageway in fluid communication with said actuator piston seat; an actuator piston associated with said body, said actuator piston including a head and a diaphragm having a first surface and a second surface, said actuator piston being slideable with respect to said body between a retracted position and an extended position, said diaphragm being located within said recess of said body such that said diaphragm is slideable within said recess as said piston slides between said retracted position and said extended position, said head adapted to sealingly engage said actuator piston seat when said actuator piston is in said retracted position, said head adapted to be disengaged from said actuator piston seat when said actuator piston is in said extended position; and a biasing member located within said recess of said body in operative engagement with said diaphragm, said biasing member
  • a valve for an aerator said valve including:
  • the present invention further provides a method of operating an aerator valve assembly, said method comprising the steps of:
  • the positive pressure actuated aerator valve assembly 10 includes a positive pressure actuated valve 12 removably attached to a housing 14.
  • the housing 14 includes a generally T-shaped body 16.
  • the body 16 includes an elongate hollow generally cylindrical conduit or tube 18 having a central longitudinal axis 20, a first end 22 and a second end 24.
  • the tube 18 includes a first flange 26 at the first end 22 and a second flange 28 at the second end 24.
  • the tube 18 includes a generally cylindrical interior wall 30 that forms a chamber 32.
  • the first flange 26 includes a generally circular and annular recessed seat 34 that extends along the inner circumference of the flange 26.
  • the body 16 also includes a generally cylindrical extension conduit or tube 40 having a first end 42 attached to the tube 18 and a second end 44 having a flange 46.
  • the flange 46 is adapted to be connected to a source of high pressure compressed gas such as air.
  • the flange 46 may be connected to a pressure vessel or tank having a chamber to which the source of high pressure gas is connected.
  • the extension conduit 40 includes a central axis 48 that is generally transverse or perpendicular to the central longitudinal axis 20 of the tube 18.
  • the extension conduit 40 includes a fluid passage 50 that extends from a first port 52 located at the second end 44 of the extension conduit 40 to a second port 54 located at the first end 42 of the extension conduit 40.
  • the second port 54 is also formed in the tube 18 such that the fluid passage 50 is in fluid communication with the chamber 32 of the tube 18.
  • the second end 24 of the tube 18 includes a generally cylindrical seat 60 that extends along the circumference of the interior surface of the tube 18 and that extends longitudinally from the second end 24 of the tube 18 to a position adjacent the port 54.
  • a cylindrical bearing 62 is located within the cylindrical seat 60.
  • the bearing 62 includes a cylindrical interior surface that forms a portion of the interior wall 30 of the tube 18.
  • the bearing 62 includes a first end located adjacent to the port 54 and a second end located at the second end 24 of the tube 18.
  • the interior surface of the bearing 62 has approximately the same diameter as the diameter of the interior wall 30 of the tube 18.
  • the bearing 62 is preferably a self-lubricating bearing having a steel backing with a porous bronze inner-structure and a PTFE overlay.
  • the housing 14 also includes a discharge piston seat 68.
  • the piston seat 68 includes a generally cylindrical conduit or tube 70 having a hollow bore forming a fluid passage 72.
  • the tube 70 extends between a first end 74 and a second end 76.
  • the tube 70 is located within the tube 18 generally concentrically about the longitudinal axis 20.
  • the first end 74 of the tube 70 includes a generally cylindrical base 78 that extends outwardly from and around the tube 70.
  • the base 78 includes two generally circular outwardly extending rings 80 that are located adjacent the interior wall of the tube 18.
  • the base 78 also includes an outwardly extending generally circular flange 82.
  • the flange 82 of the piston seat 68 is located within the circular seat 34 of the first flange 26 of the body 16.
  • a resilient elastomeric sealing member 84 such as an O-ring, is located between the flange 82 and the flange 26 to create a gas-tight seal therebetween.
  • the portion of the tube 70 of the piston seat 68 that extends beyond the base 78 is spaced apart from the interior wall 30 of the tube 18 of the body 16 such that an annular chamber 86 is formed therebetween.
  • the annular chamber 86 is in fluid communication with the fluid passage 50.
  • the second end 76 of the tube 70 includes a port 88 and a generally cylindrical recess 90 formed along the interior surface of the tube 70.
  • the second end 76 of the tube 70 includes an interior chamfered sealing surface as described in U.S. Patent No. 5,853,160 of Martin Engineering Company. The sealing surface is annular and forms the outlet port 88.
  • the housing 14 also includes an extension tube assembly 96.
  • the extension tube assembly 96 includes a generally cylindrical extension tube 98 having a first end 100 and a second end 102.
  • the extension tube 98 is located generally concentrically about the central axis 20.
  • the second end 102 of the extension tube 98 is attached to a flange 104.
  • the flange 104 is adapted to be removably connected to the first flange 26 of the tube 18 to thereby compress the flange 82 of the piston seat 68 between the flanges 26 and 104.
  • the first end 100 of the tube 98 includes a port 106.
  • the tube 98 includes a fluid passage 108 that is in fluid communication with the fluid passage 72 of the piston seat 68 and that is in fluid communication with the port 106.
  • the first end 100 of the extension tube 98 may be attached to a flange (not shown) to facilitate the attachment of the aerator valve assembly 10 to a bulk material handling structure having a chamber adapted to receive and pass bulk granular material therethrough.
  • the fluid passage 108 is adapted to be placed in fluid communication with the chamber of the bulk material handling structure.
  • the bulk material handling structure may be a storage receptacle, bin, silo, transfer chute, duct work, or other bulk material handling structure.
  • the aerator valve assembly 10 also includes a discharge piston 114.
  • the discharge piston 114 includes a generally circular plate-like diaphragm 116 and a generally cylindrical and annular skirt 118.
  • the skirt 118 forms a hollow pocket 120 having an open end.
  • the diaphragm 160 includes an outer peripheral edge 122.
  • the skirt 118 extends along the peripheral edge 122 around the perimeter of the diaphragm 116 and extends outwardly and generally perpendicularly from the diaphragm 116.
  • a plurality of bores 124 extend through the diaphragm 116 from an internal surface 126 to an external surface 128 of the diaphragm 116.
  • the bores 124 form respective fluid passages.
  • the bores 124 are located symmetrically with respect to one another about the center of the diaphragm 116 and about the axis 20.
  • the diaphragm 116 includes an outwardly projecting raised portion 130 that is centrally located on the exterior side of the diaphragm 116.
  • the projection 130 is generally circular and includes a generally circular planar surface 132, and a circular angled sealing surface 134 that extends around the circular perimeter of the planar surface 132.
  • the bores 124 are located between the sealing surface 134 and the outer peripheral edge 122 of the diaphragm 116.
  • the sealing surface 134 is disposed at the same angle as the chamfered sealing surface of the piston seat 68, such that the sealing surface 134 and the sealing surface of the piston seat 68 cooperatively and complimentarily mate and seal with one another when the sealing surfaces are brought into engagement with one another.
  • the discharge piston 114 is located within the chamber 32 of the tube 18 of the body 16 between the second end 24 of the tube 18 and the piston seat 68.
  • the skirt 118 of the discharge piston 114 is located toward the second end 24 of the tube 18 and the projection 130 of the diaphragm 116 of the discharge piston 114 is located toward the piston seat 68.
  • the diaphragm 116 and skirt 118 of the discharge piston 114 are located concentrically about the axis 20.
  • the discharge piston 114 is longitudinally slideable along the central axis 20 between an extended charge position as shown in Figure 1 , wherein the discharge piston 114 sealingly engages the piston seat 68, and a retracted discharge position as shown in Figure 3 , wherein the discharge piston 114 is spaced apart from the piston seat 68.
  • the skirt 118 of the discharge piston 114 slidably engages the interior surface of the cylindrical bearing 62 around the exterior perimeter of the skirt 118. The skirt 118 guides the piston 114 as it moves between the extended and retracted positions.
  • the aerator valve assembly 10 also includes a resilient biasing member 138, such as a helical coil spring.
  • a first end of the biasing member 138 engages the interior surface 126 of the diaphragm 116 of the discharge piston 114 and is located within the skirt 118.
  • the biasing member 138 extends from a first end adjacent to and along the internal perimeter of the skirt 118 toward a second end of the biasing member.
  • the biasing member 138 resiliently biases the discharge piston 114 toward the piston seat 68 and toward the extended charge position of the discharge piston 114.
  • the positive pressure actuated valve 12 includes a body 140 having a central longitudinal axis 141.
  • the axis 141 is coaxial with the axis 20.
  • the body 140 extends between a first end 142 and a second end 144.
  • the body 140 includes a generally cylindrical hub 146 at the first end 142.
  • the hub 146 includes a generally cylindrical side wall 148 and an annular planar end wall 150.
  • the hub 146 includes a hollow generally cylindrical recess 152 that is located concentrically within the hub 146 and that extends inwardly from the end wall 150.
  • the recess 152 forms a bottom wall 154 that includes a central generally circular aperture that forms a generally circular actuator piston seat 156.
  • a flange 158 extends radially outwardly from and around the hub 146 generally perpendicular to the central longitudinal axis 141.
  • a resilient elastomeric sealing member 160 such as an O-ring, is located on the interior surface of the flange 158 and extends around the hub 146.
  • the flange 158 of the body 140 also includes a stem 164 that extends from the hub 146 to the second end 144 of the body 140.
  • the stem 164 includes a generally cylindrical side wall 166 and a generally annular and circular planar end wall 168.
  • the stem 164 includes a generally cylindrical first recess 170 that extends inwardly from the end wall 168 toward the first end 142 of the body 140.
  • the first recess 170 forms a generally planar and annular inwardly extending ledge 172.
  • the stem 164 includes a second recess 174 that extends from the ledge 172 to a bottom wall 176 having a circular central aperture.
  • the first and second recesses 170 and 174 are concentrically located about the longitudinal axis 141.
  • the body 140 of the positive pressure actuated valve 12 includes a generally cylindrical bore 178 that extends from the actuator piston seat 156 to a generally annular wall 180 having a generally circular central aperture 182.
  • the body 140 also includes a generally cylindrical bore 184 that extends from the central aperture in the bottom wall 176 to a generally annular end wall 186 that includes the aperture 182.
  • the recess 152, bore 178, bore 184, second recess 174 and first recess 170 are all connected to one another.
  • the body 140 includes one or more fluid vent passages 190.
  • Each vent passage 190 includes a first end in fluid communication with the bore 178 and the actuator piston seat 156, and a second end that is in fluid communication with the atmosphere.
  • a fluid passageway extends from the second recess 174 to a vent passage 190 such that the second recess 174 is in fluid communication with the atmosphere.
  • the positive pressure actuated valve 12 also includes a cap 194 that is removably attached to the end wall 168 of the stem 164 by threaded fasteners or the like.
  • the cap 194 includes a body 195.
  • a resilient elastomeric sealing member 86 such as an O-ring, is located between the body 195 and the end wall 168 and is adapted to create a gas-tight seal therebetween.
  • the body 195 includes a fluid passage 198 that extends through the body 195 and that is in fluid communication with the first recess 170 of the stem 164.
  • the fluid passage 198 includes a port 200 that is adapted to be attached in fluid communication with a source of compressed pressurized gas, such as air.
  • the port 200 may be attached in fluid communication with a valve, such as a solenoid valve, to control the flow of gas into and out of the port 200 and fluid passageway 198.
  • the body 195 includes a stepped-bore 202 that extends through the body 195 from its internal surface to its external surface.
  • the bore 202 includes a large diameter recess 204 that extends inwardly from the interior surface of the body 195 and a reduced diameter recess 206 that extends inwardly from the outer surface of the body 195.
  • the body 195 also includes a generally U-shaped collar 210 that is attached to the external surface of the body 195.
  • the collar 210 includes a two spaced apart opposing side walls 212.
  • the cap 194 includes a plunger 216 slidably located within the bore 202.
  • the plunger 216 includes a first end 218 and a second end 220.
  • the plunger 216 includes a generally cylindrical head 222 at the first end 218 that is adapted to fit closely within the large diameter recess 204 of the bore 202.
  • the plunger 216 also includes a generally cylindrical shaft 224 that extends from the second end 220 to the head 222.
  • the shaft 224 extends through the reduced diameter recess 206 of the bore 202 such that the second end 220 of the plunger 216 is located within the collar 210 between the side walls 212.
  • the cap 194 also includes a manual actuator member 230, such as a lever, trigger or button.
  • the actuator member 230 extends between a first end 232 and a second end 234.
  • the actuator member 230 is pivotally attached to the side walls 212 of the collar 210 such that the first and second ends 232 and 234 pivot about a pivot axis 236 with respect to the body 195 of the cap 194.
  • the positive pressure actuated valve 12 also includes an actuator piston 240.
  • the actuator piston 240 includes a head 242.
  • the head 242 includes a generally circular and planar outer end wall 244 and a generally conical-shaped side wall 246.
  • a first end of the conical side wall 246 includes a large diameter circular edge located at the end wall 244 and a second end of the side wall 246 includes a reduced diameter circular edge.
  • the side wall 246 of the actuator piston 240 is adapted to releasably engage the piston seat 156 to selectively create a gas-tight seal therewith.
  • the actuator piston 240 also includes a generally cylindrical diaphragm 250 located within the first recess 170 of the stem 164.
  • the outer peripheral edge of the diaphragm 250 includes a resilient elastomeric sealing member 252, such as an O-ring.
  • the sealing member 252 creates a gas-tight seal between the diaphragm 250 and the internal wall of the stem 164 while allowing sliding movement of the diaphragm 250 within the first recess 170 between a retracted position and an extended position.
  • the interior side of the diaphragm 250 includes an elongate generally circular groove 254.
  • the actuator piston 240 also includes a generally cylindrical stem 260 that is attached at a first end to the internal surface of the head 242 and that is removably attached at a second end to the diaphragm 250 by a fastener 262.
  • the diaphragm 250 and the head 242 thereby slide conjointly with one another between a retracted position and an extended position along the axis 141.
  • the diaphragm 250 divides the recesses within the stem 164 into a first chamber 256 that is located between the diaphragm 250 and the bottom wall 176 of the second recess 174, and a second chamber 258 that is located between the diaphragm 250 and the cap 194.
  • the positive pressure actuated valve 12 also includes a resilient biasing member 268, such as a helical coil spring.
  • the biasing member 268 has a first end in engagement with the bottom wall 276 of the second recess 174 of the stem 164, and a second end located within the circular groove 254 of the diaphragm 250.
  • the biasing member 268 resiliently biases the actuator piston 240 from the extended discharge position as shown in Figure 2 to the retracted charge position as shown in Figure 1 .
  • a fluid chamber 274 is formed between the discharge piston 114 and the body 195 of the positive pressure actuated valve 12.
  • the biasing member 138 extends between the discharge piston 114 and the body 195 of the positive pressure actuated valve 12, and extends around the side wall 148 of the hub 146 of the body 140.
  • Figures 9 and 10 show an alternate embodiment of the body of the positive pressure actuated valve 12 identified with the reference number 280.
  • the body 280 is constructed substantially similar to the body 140 and similar elements are identified with the same reference numbers.
  • FIGS 11 and 12 show an alternate embodiment of the cap of the positive pressure actuated valve 12 identified with the reference number 290.
  • the cap 290 is constructed substantially similar to the cap 194 and similar elements are identified with the same reference numbers.
  • Each side wall 212 of the collar 210 includes an aperture 292 and an aperture 294.
  • the apertures 292 are coaxially aligned with one another along the pivot axis 236.
  • the apertures 294 are also coaxially aligned with one another.
  • the apertures 294 are adapted to removably receive a locking pin.
  • the locking pin is adapted to be removably inserted through at least one aperture 294 and through an aperture in the actuator member 230 such that the locking pin prevents movement of the actuator member 230 about the pivot axis 236 and thereby prevents accidental manual actuation of the positive pressure actuated valve 12 and aerator valve assembly 10 by the actuator member 230.
  • the locking pin is manually removed from the aperture in the actuator member 230 to permit manual pivotal movement of the actuator member 230 about the pivot axis 236 with respect to the body 195 of the cap 290.
  • the discharge piston 114 In operation, as shown in Figure 1 , the discharge piston 114 is located in its extended charge position and the actuator piston 240 is located in its retracted charge position.
  • the sealing surface 184 of the discharge piston 114 sealingly engages the sealing surface of the piston seat 68 to create a gas-tight seal therebetween.
  • a fluid passage from the fluid passage 50 of the extension conduit 40, through the annular chamber 86, and through the port 88 of the piston seat 68 to the fluid passage 72 of the piston seat 68 is thus sealed closed by the discharge piston 114.
  • the conical side wall 246 of the actuator piston 240 creates a gas-tight seal with the actuator piston seat 156 to seal closed a fluid passage from the fluid chamber 274 through the actuator piston seat 156 to the vent passages 190.
  • Pressurized gas may flow through a fluid passage extending from the fluid passage 50 in the extension conduit 40, through the annular chamber 86, through the bores 124 in the discharge piston 114, and into the fluid chamber 274.
  • the pressurized gas within the fluid chamber 274 biases the discharge piston 114 to its extended charge position and acts upon the end wall 244 of the head 242 of the actuator piston 240 to bias the actuator piston 240 toward its retracted charge position.
  • the first chamber 256 of the positive pressure actuated valve 12 is in fluid communication with the vent passages 190 through the aperture 182 and bore 184 and is therefore at atmospheric pressure.
  • a storage tank or other vessel attached to the extension conduit 40 may then be fully charged with compressed gas, such as air, at a desired pressure greater than atmospheric pressure.
  • pressurized air having a positive pressure greater than atmospheric pressure is supplied to the second chamber 258 of the positive pressure actuated valve 12 through the fluid passage 198.
  • the surface area of the diaphragm 250 that is in communication with the second chamber 258 is larger than the surface area of the end wall 244 of the head 242 of the actuator piston 240.
  • the pressurized gas within the second chamber 258 may provide a sufficient resulting biasing force to bias the actuator piston 240 toward the extended discharge position as shown in Figure 2 , while overcoming the force of the gas in the fluid chamber 274 and biasing force of the biasing member 268, to compress the biasing member 268 and slide the actuator piston 240 from the retracted position toward the extended position.
  • the gas force acting on the exterior side of the piston 114 which force attempts to slide the piston 114 to the retracted position, is larger than the cumulative force exerted on the piston 114 by the pressure of the gas acting on the interior side of the piston 114 plus the biasing force exerted by the biasing member 138, which forces attempt to slide the piston 114 to the extended position.
  • the differential in gas pressure, and the resulting difference in the gas pressure forces applied to the piston 114 cause the piston 114 to slide from the extended charge position as shown in Figures 1 and 2 , toward the positive pressure actuated valve 12 and toward the discharge position of the piston 114 as shown in Figure 3 , while compressing the biasing member 138.
  • the movement of the piston 114 from the extended position to the retracted position breaks the seal created between the piston 114 and the piston seat 68 and opens the fluid passage from the compressed gas storage tank, through the fluid passage 50 of the extension conduit 40, through the annular chamber 86, through the port 88 of the piston seat 68 and into the fluid passage 72.
  • the gas flows from the passage 72 through the fluid passage 108 and out the port 106 of the extension tube assembly 96 and into the chamber of the storage bin to dislodge the granular material therein.
  • the supply of pressurized gas to the second chamber 258 of the positive pressure actuated valve 12 is turned off, and the second chamber 258 is placed in fluid communication with the atmosphere through the fluid passageway 198.
  • the gas within the second chamber 258 consequently returns to atmospheric pressure.
  • the gas in the first chamber 256 and the second chamber 258 are therefore both at atmospheric pressure.
  • the biasing member 268 then biases the actuator piston 240 to the retracted position as shown in Figure 1 wherein the head 242 creates a seal with the actuator piston seat 156.
  • a supply of pressurized gas from the pressure tank then flows through the passage 50, the annular chamber 86, and the bores 124 in the discharge piston 114 into the fluid chamber 274.
  • the pressure of the gas within the fluid chamber 274 thereby equalizes with the pressure of the compressed gas within the annular chamber 86, and the biasing member 138 biases the discharge piston 114 to the extended charge position as shown in Figure 1 thereby creating a seal with the piston seat 68.
  • the charging and discharging cycles of the aerator valve assembly 10 may then be selectively continued.
  • the aerator valve assembly 10 may be manually actuated to discharge compressed gas from a pressure tank attached to the extension conduit 40.
  • the first end 232 of the manual actuator member 230 is manually grasped and pivoted in a counter-clockwise direction about the pivot axis 236.
  • the second end 234 of the manual actuator member 230 is thereby also pivoted about the pivot axis 236 into engagement with the second end 220 of the plunger 216.
  • Continued counter-clockwise pivotal movement of the manual actuator member 230 causes the plunger 216 to slide along the axis 141 from its retracted position, as shown in Figure 1 , to its extended position as shown in Figure 4 .
  • the head 222 of the plunger 216 engages the diaphragm 250 of the actuator piston 240 and slides the actuator piston 240 along the axis 141 from its retracted position toward its extended discharge position as shown in Figure 4 .
  • the pressurized gas within the fluid chamber 274 is then exhausted to the atmosphere through the vent passages 190 as described above.
  • the discharge piston 114 then moves toward its retracted position as described above to discharge gas from the pressure tank through the piston seat 68 and extension tube assembly 96.
  • the manual actuator member 250 may be released.
  • the biasing member 268 then slides the actuator piston 240 and the plunger 216 from their extended discharge positions to their retracted charge positions.
  • the plunger 216 pivots the manual actuator member 230 from its discharge position as shown in Figure 4 to its charge position as shown in Figure 1 .
  • the manual charging and discharging cycles of the aerator valve assembly 10 may be continued selectively as desired.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Fluid-Driven Valves (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
EP05250028A 2004-01-14 2005-01-06 Positive pressure actuated aerator valve assembly Expired - Fee Related EP1555220B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53644604P 2004-01-14 2004-01-14
US536446P 2004-01-14

Publications (3)

Publication Number Publication Date
EP1555220A2 EP1555220A2 (en) 2005-07-20
EP1555220A3 EP1555220A3 (en) 2005-12-07
EP1555220B1 true EP1555220B1 (en) 2010-04-07

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Application Number Title Priority Date Filing Date
EP05250028A Expired - Fee Related EP1555220B1 (en) 2004-01-14 2005-01-06 Positive pressure actuated aerator valve assembly

Country Status (10)

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US (1) US7273205B2 (pt)
EP (1) EP1555220B1 (pt)
CN (1) CN100389282C (pt)
AU (1) AU2005200140B2 (pt)
BR (1) BRPI0500078B1 (pt)
CA (1) CA2491775C (pt)
DE (1) DE602005020375D1 (pt)
ES (1) ES2342832T3 (pt)
MX (1) MXPA05000603A (pt)
ZA (1) ZA200500295B (pt)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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AU2005200140B2 (en) 2010-05-13
BRPI0500078A (pt) 2005-09-06
EP1555220A2 (en) 2005-07-20
CN100389282C (zh) 2008-05-21
ES2342832T3 (es) 2010-07-15
MXPA05000603A (es) 2006-01-18
AU2005200140A1 (en) 2005-07-28
CN1641250A (zh) 2005-07-20
US7273205B2 (en) 2007-09-25
ZA200500295B (en) 2006-07-26
CA2491775A1 (en) 2005-07-14
BRPI0500078B1 (pt) 2017-11-28
EP1555220A3 (en) 2005-12-07
DE602005020375D1 (de) 2010-05-20
CA2491775C (en) 2008-11-18

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